2. PERFORMANCE REPORTING ANALYSIS › 2.7 Graphic Analysis › 2.7.1 CPU Graphs › 2.7.1.1 CPU Busy by Hour and Day

2.7.1.1 CPU Busy by Hour and Day

GRAPHIC RESULTS

This graphic analysis provides a multiline plot of CPU busy,
plotted by hour of the day, with each line representing data
from a different day.

ANALYSIS GUIDELINES

This plot shows you CPU busy information for a specific
system for multiple days.  You should look here to ensure
that the data being analyzed is both repeatable and
consistent.  You should know whether you are analyzing a
typical day, a peak load day that is to be expected with some
regularity, or an unusual occurrence that might be repeated
only very rarely.

Notice the CPU busy patterns throughout a day.  When
analyzing performance, it is important to know the
characteristic times of peak loads during the day.  These
patterns also allow you to readily see when there are CPU
resources available.  If you know the major workloads that
run on a processor, you may be able to determine when these
workloads are most significant to overall utilization.  This
is determined by noting the times when these workloads
normally begin to increase and taper off.  Normally, when
looking for CPU problems, you would select the times when the
systems are running at maximum utilization.

The detailed behavior of workloads and the system influences
that may be affecting them can be further analyzed using the
Installation Performance Specification analysis reports.
Note that, when in goal mode, the IPS controls are "hidden"
so you can't change them.  The Workload Manager decides the
settings and automatically implements them.